Madfinger's handsome zombie shooter Dead Trigger has provoked the ire of some early adopters after going free to play on Android within weeks of its initial launch.

As well as including a meat van's-worth of new weapons and arenas, last Friday's update to Dead Trigger removed the game's dollar price point, turning it from a premium game to a freemium game in one fell swoop.

While many are no doubt pleased to add this gory blaster to their Android library free of charge, the decision has angered customers who dropped some coin on the shooter over the last couple of weeks, some of whom have voiced their outrage on Google Play via angrily worded one-star reviews.

One example from an anonymous Transformer TF201 user reads: "Feel I have wasted money... Wish I could take my 1 star away. Cheated again."

Buyer's remorse

This isn't the first time a developer has upset paying customers by switching to a free-to-play model.

Whale Trail dev ustwo incurred the wrath of fans when it performed the same payment model switch-up on its colourful endless-flyer.

The company later admitted to Modojo that "we should have done a better job of helping players through the transition."

Dead Trigger is free to download on Google Play, but does contain in-app purchases. The game is still 69p / 99c on the App Store.